What is the most accurate conclusion we can draw from research on the long-term effects of drug use on brain and behavior?
a. It tends to be harmful, is never reversible, and animal research confirms this.
b. It tends to be harmful, the effects can be reversed, and animal research confirms this.
c. It may be harmful but we can never know how exactly because drug users tend to use many different drugs and animal research is rarely done to study drug abuse.
d. Long-term use is rarely harmful. Behavioral and brain problems are always present before a person even begins using drugs.
Answer: B
Rationale: Controlled animal studies indicate that the brain damage found in human drug users is likely caused by the toxicity of the drugs. But brain plasticity and abstinence from drugs can help recovery.
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